I would advise against it. Mega buck tube amps can have both the current and voltage to drive the difficult loads of the SL3 (and other Martin Logan speakers), but at the 2k range I think your friend would be happier with solid state. One possiblity is to have tubes for the panels and solid state amp for the woofer. This eliminates the voltage demand that the woofers may need on the tube amp (driving the panels only). If your friend does do this they will need at least one of the amps with an adjustable input so they can match the levels. This can be tricky, particularly due to non-linearities of different amplifiers. I think what I'm getting at is--at 2k I wouldn't advise it. Probably not what they wanted to hear--but better than spending the money and being very disappointed.
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